Rotary gun



April 3, 1934. Y' L. D. PEIK 1,953,311

ROTARY GUN A Filed March 14, 1951y 2 sheets-sheet, 1

April 3, 1934. Y' l.. D. PEIK y 159553,311

ROTARY GUN Filed March 14, 1931 2 Sheeis-Sheet, '2

Smau/woz @las Ped 35th abme/134 Patented Apr. 3, 1934 UNITED STATES l 1,953,311 PATENT OFFICE N ROTARY lGUN Louis D. Peik, Mishawaka, Ind., assignor to The American Foundry Equipment Company, New York, N. Y.,'a corporation of Delaware Application March 14, 1931, Serial No. 522,541

7 Claims.

Areservoir having individual nozzles at the end thereof for delivering a mixture of air and abrasive at high velocity therefrom. A man inlet pipe may be provided on the axis of rotation for delivering to said distributing reservoir a mixture of pre-carburetted abrasive particles and air. Suitable means may be provided for-spreading and contracting the individual nozzles so as to vary the effective blasting area. Suitable means may be provided for protecting the distributing reser- O voir from the blasting action of the abrasive which it distributes to the several nozzles.

It is within thethe contemplation of the present invention to rotate the gun at not higher than a certain peripheral speed below which the greatest efficiencies are developed. The rotaryl The invention also consists 'incertain new and original features of construction and combinations of parts hereinafterset forth andclaimed. Although the novel features which are believed to be characteristic of this invention will be par- 'ticularly pointed out in the claims appended hereto, the invention itself,`as to its'objects and advantages, and the manner in which it may be carried out, may be better understood by referring to the following description taken in connection with the accompanying drawings'forming a part thereof, in which Fig. 1 is a central longitudinal section taken through a rotary gun according to the invention;

Fig. 2 is a section on the line 2 2 of Fig. 1;

Fig. 3 is an end view of the rotary gun; and

Fig. 4 indicates more or less diagrammatically two guns of the character described cleaning simultaneously the opposite surfaces of a sheet of steel or the like.

In the following description and in the claims, various details will be identified by specic names for convenience, but vthey are intended to be as generic in their application as the art will permit.

.Like reference characters denote like parts in the several gures of the drawings.

In the drawings accompanying and forming part of this, specification, certain specific disclosure of the invention is made for purposes yof explanation, .butit will be understood that the details may be modified in various respects without departure from the broad aspect of the invention. 4

Referring nowto the drawings, the rotary nozzle or gun is journalled in a bearing housing, indicated by 11, to which is connected agear housing, indicated by 10. .Annular seats, indicated by 12 and 13, are provided in which are positioned conical roller bearing assemblies 14 and 15 for withstanding bothradial andaxial stress.'

Located within the assemblies 14fand 15 is a hollow spindle' 16 having a flange 17 at one end and also a circular boss 18. IThe flange 17 is provided with a cylindrical sleeve `member 19 for forming a tight seal with thevbearing housing 11 as hereinafter described more in detail.

.Secured to the other end of the hollow spindle 16 is a -worm wheel ZOkeyed to spindle 16 by key 21. A nut '22 is threaded upon the end of spindle 16 Ato lock the gear 20 in position on thev spindle 16.

The worm wheel 20 is made lwith a deep annular recess in which .is positioned a conical shield 23 which is sutably connected to the seat 12 to guard the oil in the bottom of the gear housing from being lost`in the bearing housing 11.

Meshing with the worm wheel is a worm 24 which is partially immersed in oil (not shown) in the bottomof'the gear housing, 10.- The worin 24 vis mounted upon a suitable shaft 'T4 which in turn is mounted in conical roller bearing assemb1ies'72 and 73, which in turn are mounted in seats in caps and 71 which are suitably bolted to the gearing 'housing 10, as indicatedv particularly in Fig. 2.l

The gearing housing 10 is provided with a removable cover 26 bolted thereto by bolts 28,4the cover having a boss 27 to whichA is secured by 'screws 30 a` conduit 29 which may be made of flexible material such as rubber and which passes through the boss 2'7 and the rotary spindle, 16, as

indicated. 4

It will be understood that the various joints in the gearing housing and bearing housing are sealed by suitablepacking, indicated by 31, 32, 33, etc.

The housing reservoir 40 is centered upon lthe boss 18 and secured to ange 17 by a pluralityof bolts 41. The housing 40 is cylindrical and has a header 42 secured to one end thereof 4with a suitable gasket 53 therebetween.

The header 42 is provided with a pluralityof bosses or nipples 43 in which are positioned flexible hose conduits of rubber o r other suitable material, indicated by' 45. Conduits 45- are secured to nipples 43 by wood screws 46 and have nozzle Y bodies 47 secured at their outer ends. Individual nozzles 48 are secured to the nozzle bodies 47, as indicated.

If desired, a metal cone member 70 may be spot-Welded to header 42 as indicated at 7l. This assists in preventing uneven firing of the nozzles and prevents the distributing reservoir from getting out of balance due to uneven distribution of the abrasive in the reservoir.

The header 42 opposite the supply conduit 29 is provided with a recess, 44, to thewall of which is secured a stud 49 on which is slidably mounted a collar 50. Links52 pivotally connect the collar 50 to the respective nozzle bodies 47. A setscrew 51 passes through the collar 50 to clamp the col-1y lar at any desired position on the stud 49 to po- V. sition radially the nozzles 48 inthe desired radius, as indicated by the dotted lines in Fig. 1.

It will be understood that a mixture of precarburetted air and sand is supplied to the feed conduit 29 from a source not shown. It has been found, in blasting with a rotary gun that the efciency dropsoff very rapidly when the gun is rotated at a peripheral speed of the individualnozzles 48 above speeds of the order of 700 feet per minute and below speeds of the order of 100 feet per minute as the efficiency, as measured by the metal removed from the test sheet in ounces per minute, falls off very materially at speeds not within this range. i

The operation of the distributing reservoir 40 and the rotation of the gun assists in distributing the carburetted sand equally between the sevl eral nozzles. It is imporant that the sand be dis- `to the nozzles 48. It will be understood that a suitable source of power will be applied to the shaft'76 which will drive the lshaft 74 through the coupling 75 (Fig. 2).

The advantage of the rotating nozzles is freedom from streaks on the work as the work travels past the gun which would otherwiseoccur if the nozzles were not rotating. Each individual nozzle following immediately after the preceding nozzle and delivering its stream of' abrasive 'causes 'a'nir'e 'iifrm "distributienet tlie'abra'-- sive on the entire length and breadth of the work as it is moved through the blastingapparatus.

These rotary guns are useful especially in cleaning large castings and work of large area such asshe'et material. In addition to the cleaning action of a single gun cleaning one surface alone, material to be cleaned may be passed between two rotary guns, as indicated in Fig. 4, both sides of the material being cleaned simultaneously. Due to the eicient cleaning action of these guns andthe comparatively large area of work which can be cleaned, the material passing between two rotary guns can be cleaned with great eiiiciency in a comparatively small time. In other words, the material, in this case the sheet 60 in Fig. 4, may loe-passed comparatively rapidly between theoppositely disposed rotary guns, indicated by 61 and 62.

While certain novel features of the invention have been disclosed and are pointed out in the annexed claims, it will be understood that various omissions, substitutions and changes may be made by those skilled in the art without departing from the spirit of the invention.

What is claimed is: l

1. In`a rotary gun, a bearing,.a hollow spindle in said bearing, a driven power-transmitting member on said spindle, a distributing reservoir secured to said spindle,- flexible conduits secured to said reservoir, nozzles secured to said conduits,

and means for controlling the spread of said nozzles.

2. In a rotary gun, a housing, a bearing in said housing, a hollow spindle in said bearing,

Asecured' to said distributing reservoir, a Worm wheel secured to the other end 'of said spindle,

a worm engaging said worm wheel, a gear housing secured to said bearing housing surrounding said worm and worm wheel, a cover closing said gear housingl and-havinga hollow boss, a single stationary feed pipe secured within said boss and passing through said spindle to feed said distributing reservoir with a pre-carburetted mixture of abrasive particles and carrying fluid.

4. In a rotary abrasive blast gun, a stationary bearing, a rotary distributing reservoir jornalled in said bearing, a conduit-feeding said reservoir axially of 'said bearing, exible hoses secured to said reservoir, nozzles on the`ends of said hoses,

a stud secured to said reservoir, a collar on said A6. In a rotary abrasive blast gun, a stationarybearing, a rotary distributing reservoir journalled in said bearing, a conduit feeding said reservoir axially of said bearing, a header closing said reservoir and having a plurality of nipples, flexible hoses in said nipples, nozzles on the ends of said hoses, said header carrying a recess in line with Asaid conduit, a stud secured to the wall of said recess, a collar on said stud and links pivoted to said collar and to said nozzles.

7. In a rotary gun, a plurality of individual nozzles. means for feeding said nozzles with abrasive particles and carrying fluid, means for revolving said nozzles about a common axis of revolution and means for adjusting the spread of said nozzles with respect to said common axis of revolution. LOUIS D.PEIK. 

